US2438794A

US2438794A - Packing or sealing ring

Info

Publication number: US2438794A
Application number: US646273A
Authority: US
Inventors: Waring Arthur
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-09-01
Filing date: 1946-02-08
Publication date: 1948-03-30
Anticipated expiration: 1965-03-30

Description

March 30, 1948. A. wARlNG PACKING '.OR SEALING RING Filed Feb. 8. 1946v R//UR NFR/IV@ @WWW/4g Patented Mar. 30 1948 UNITED sTATl-:s PATENT ori-ICE Application February 8, 1946, Serial No. 64.6,273

In Great Britain September 1, 1945 3 Claims.` 1

This invention refers to certain improvements in packing or sealing ring devices of the type fixed in a stationary housing and having an annular sealing lip which bears on a shaft or the like and having a helical spring in the form of a garter which bears on the lip to vpress the same on the shaft. Should the shaft run eccentrically in relation to the packing ring the annular lip is distorted and a gap may be formed between the sealing lip and the shaft so that the efficiency of the seal lis affected. This invention has for its object toobviate this defect.

According to the present invention, a ring is arranged around the garter spring and is floatingly mounted so that it can move with the spring and tend to keep the spring garter in contact with the lip and hold it in pressure contact entirely laround the shaft under all conditions of distortion. such as the distortion cause/d by the shaft running eccentric. Any such distortion of the shaft will cause the lip to distort on one side, producing a movement of the spring which is transferred to the ring, and the ring will thus move with the spring and pull the spring con-v centric with the shaft. Thus the garter spring will apply an eiiicient pressure entirely around' the sealing lip when so distorted.

Referring to the drawings:

Figure 1 is a section on line I-I of Figure 2 of a sealing ring device embodying the invention.

Figure 2 is a section on line II-II of the device of Figure 1, and A Figure 3 is a similar view to Figure 1, but illustrating the position of the sealing lip distorted.

According to a convenient embodiment of this invention, the ysealing device is of the type comprising a metal casing I which is a. push t in a( housing surrounding the shaft. A leather, rub-` ber or like pealing washer 2, L-shaped in cross sectiornis fixed in the casing l, one flange 4 being fixed against the face of the end flange 3 of the casing, While the other flange 5 of the washer 2 inclines inwardly and forms a sealing lip 6 bearingl on the shaft. A garter spring 'l formed of helically coiled wire bears on the outer periphery of the sealing lip 6 andapplies pressure holding the lip in the sealing position. A cylindrical ring 8 is placed around the garter spring so that it is substantially in contact with the periphery of the spring when in position on the sealing lip which in turn is applied with sealing pressure around a shaft (not shown). If a local pressure vis placed on one side of the sealing lip, as for instance when a shaft is running eccentric. the

lip is distorted at one side radially outwards from the position shown in dotted'lines to the position in full lines Figure 3, and consequently moves the spiral spring 'l locally in the same direction. -The spiral garter spring 'l bears on the ring 8 and the ring moves outwardly with the spring. The other side of the ring therefore moves inwardly and causes the spring 'I to move inwardly and thus tends to assume a position concentric with the shaft, tending to hold the spiral spring concentric with the shaft to give a sealing pressure entirely round the lip when distorted. When the ring 8 is not present, any undue pressure on one side of the sealing lip 6 due to eccentricity of the shaft, causes the lip to shift away from the shaft on the diametrically opposite side, thus breaking down the seal. The ring 8 is prevented from lateral disengagement from the garter spring 'l and this is conveniently effected bythe ring I being constrained to have a radial movement between internal walls of the sealing device. 'By this invention therefore an effective even pressure of the sealing lip is maintainedunder all conditions.

Furthermore the ring 8 surrounding the garterspring 1 'can cause the coils of the spring to be distorted radially and thus increase the eil'ectiveness of the spring by a squeezing pressure.

Having thus described the invention. what is claimed as new and desired to be secured by Letters Patent is:

1. A sealing device having a casing for surrounding a shaft comprising an annular sealing lip which bears on the shaft, a helically coiled garter spring which surrounds the lip, and a rigid ring iioatlngly mounted in said casing and surrounding the garter spring and in substantial contact with the latter when said sealing lip is in sealing contact with said shaft, so that radial outward deflection on one side of the sealing lip and garter spring will cause said ring, by pressure of the garter spring thereon, to be moved radially outwardly on the said side and radially inwardly on the opposite side and thus cause the garterv spring to be adjusted for maintaining a sealing pressure entirely around the sealing lip.

2. A sealing device having a casing surrounding a shaft, said casing enclosing an annular sealing lip which bears on the shaft, a helically coiled garter spring which'surrounds the lip. and a rigid ring iloatingly mounted in said casing around the garter spring and in substantial contact therewith to prevent the garter spring from being distorted outwardly, and means within said casing for preventing the rigid ring from moving laterally out of engagement with the garter. spring.

l3. A sealing device adapted to be mounted in a casing surrounding a shaft, comprising an annular sealing lip which bears on the shaft, a helically coiled garter spring surrounding and in contact with the lip, and a'rigid ring oatingly mounted in said casing around the garter spring and in substantial contact therewith to prevent the garter spring from being distorted outwardly, and means adjacent said ring for preventing the latter from moving laterally out of engagement with the garter spring, said ring being o! smaller 10 Number internal diameter than the outside diameter of said garter spring.

ARTHUR WARING.

REFERENCES CITED The following references are of record in the le oi this patent:

UNITED STATES PATENTS Name Date 1,995,813 Olson Mar. 26, 1935 V2,070,638 MQCOmbs L Feb. 16, 1937